SImple answer...NO! The tone ring models are tuned reflex enclosures, with the slots on the sides of the baffle sserving as ports to tune the cabinet. Mounting a speaker on standoffs would just remove all of the lower frequencies.

Porting isn't useful in a guitar cabinet. It only affects the frequencies below guitar range. Just put the back on...a sealed box is the most usefull and the hardest to mess up. Ports have to be tuned properly to be useful, and the cabinet has to be the correct size.

You want to separate the front of the speaker as much as possible from the rear to increase low end response. Bass reflex tuned ports are infinitely better than the tone ring. As BZ said, porting is usually relegated to hi-fi cabs to lower the frequency response---below guitar range. Just go with a sealed box and don't scrimp on the fiberglass batting inside.